The Reynolds number Re is a dimensionless group that characterizes the intensity of a flow. For large

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The Reynolds number Re is a dimensionless group that characterizes the intensity of a flow. For large Re, a flow is turbulent; for small Re, it is laminar. For pipe flow, Re ≡ uρD/μ, where D is pipe diameter and μ is dynamic viscosity.
(a) If D and μ are fixed, what is the effect of increasing mass flow rate ṁ on Re?
(b) If ṁ and μ are fixed, what is the effect of increasing D on Re?

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